CN112054526A - Ground signal and on-board unit's higher harmonic suppression device - Google Patents
Ground signal and on-board unit's higher harmonic suppression device Download PDFInfo
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- CN112054526A CN112054526A CN202010979379.0A CN202010979379A CN112054526A CN 112054526 A CN112054526 A CN 112054526A CN 202010979379 A CN202010979379 A CN 202010979379A CN 112054526 A CN112054526 A CN 112054526A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The application discloses a higher harmonic suppression device of ground signal and vehicle-mounted equipment, which is applied to a substation, a subarea station or a switching station of a traction power supply system of a railway system and particularly comprises AT least one filter circuit, namely, the filter circuits are respectively arranged between a contact line and a steel rail of a power supply arm and between a positive feeder and the steel rail in an AT power supply mode, the filter circuit is arranged between the contact line and the steel rail of the power supply arm in a direct power supply mode, and the higher harmonic on a loop between the contact line/the positive feeder and the steel rail can be filtered through the filter circuit, so that the fluctuation of the receiving voltage of a track circuit or the abnormal braking of a locomotive caused by the higher harmonic can be avoided.
Description
Technical Field
The application relates to the technical field of railway signals, in particular to a ground signal and high-order higher harmonic suppression device for vehicle-mounted equipment.
Background
With the progress of power electronic technology, the ac-dc-ac technology based on fully-controlled devices such as GTO, IGBT, IGCT and the like is widely applied to electric locomotives and motor train units, the power factor approaches 1, the current quality is also improved, the harmonic current in low frequency bands such as 3, 5 and 7 times is remarkably reduced, the harmonic current in low frequency bands is reduced, meanwhile, the higher harmonic in higher frequency bands (such as more than 20 times) is increased, and the signal working frequency band (550-850 Hz or 1500-3000 Hz) is covered.
The inventor of the application finds in practice that in the process of transmitting the higher harmonics emitted by the locomotive through the steel rail, when the potentials at two ends of the steel rail are unequal, the higher harmonics can be coupled to receiving equipment of a track circuit through an insulating joint of the track circuit, so that the receiving voltage of the track circuit fluctuates; if the unbalanced current carrying the higher harmonic is received by the induction coil at the bottom of the locomotive, the unbalanced current is mistakenly identified by the vehicle-mounted ATP as a low-frequency carrier frequency signal, and the abnormal braking of the locomotive may be caused according to the processing logic of the vehicle-mounted ATP.
Disclosure of Invention
In view of the above, the present application provides a harmonic suppression device for ground signals and on-board equipment, which is used for suppressing harmonics so as to prevent the track circuit receiving voltage fluctuation or abnormal braking of the locomotive caused by the harmonics.
In order to achieve the above object, the following solutions are proposed:
a higher harmonic suppression device of ground signal and on-board equipment is applied to a substation, a subarea station or a switching station of a traction power supply system of a railway system, and comprises at least one filter circuit, wherein:
in the AT power supply mode, one filter circuit is connected between a contact line of a power supply arm and a steel rail in parallel, and the other filter circuit is connected between a positive feeder of the power supply arm and the steel rail in parallel;
in the direct power supply mode, the filter circuit is connected in parallel between the contact line of the power supply arm and the steel rail.
Optionally, the filter circuit is a passive filter circuit, an active filter circuit, or a hybrid active filter circuit.
Optionally, the circuit structure is a second-order filter, and the filter circuit includes a capacitor, a resistor, and a reactor, wherein:
one end of the capacitor is connected with the contact line, and the other end of the capacitor is connected with one end of the resistor;
the other end of the resistor is connected with the steel rail;
the reactor is connected in parallel with the capacitor.
Optionally, further comprising a discharge coil, wherein:
the discharge coil is connected in parallel with the capacitor.
Optionally, still include circuit breaker and arrester, wherein:
the circuit breaker is arranged on a connecting line for connecting the first capacitor and the contact line;
one end of the lightning arrester is connected with the lower end of the breaker, and the other end of the lightning arrester is grounded.
Optionally, the active filter circuit includes a first compensation current generation circuit, a first harmonic detection module, a first current tracking control module, a first step-down transformer, and a first filter reactor, where:
the output end of the first compensation current generating circuit is connected with the secondary side of the first step-down transformer through the first filter reactor;
one end of the primary side of the first step-down transformer is connected with the contact line or the positive feeder line, and the other end of the primary side of the first step-down transformer is connected with the wiring terminal;
the first harmonic detection module is connected with the contact line or the positive feeder line and is used for detecting harmonic signals on the contact line or the positive feeder line;
the second current tracking control module is used for receiving the harmonic signal and outputting a driving pulse to the first compensation current generating circuit based on the harmonic signal.
Optionally, the hybrid active filter circuit includes a second compensation current generation circuit, a second harmonic detection module, a second current tracking control module, a protection controller, a second step-down transformer, a second filter reactor, the passive filter circuit, and a fundamental series resonant circuit, wherein:
one end of the passive filter circuit is connected with the contact line or the positive feeder line, the other end of the passive filter circuit is connected with one end of the primary side of the second step-down transformer, and the other end of the primary side is connected with the wiring terminal;
the fundamental wave series resonance circuit is connected with the primary side in parallel;
the output end of the second compensation current generating circuit is connected with the secondary side of the second step-down transformer through the second filter reactor;
the second current tracking control module is used for detecting whether the second compensation current generator has faults or overcurrent;
the second harmonic detection module is connected with the contact line or the positive feeder line and is used for detecting harmonic signals on the contact line or the positive feeder line;
the protection controller is used for protecting the hybrid active filter circuit.
Optionally, the fundamental wave series resonant circuit includes a third capacitor and an inductor coil connected in series.
It can be seen from the above technical solutions that the present application discloses a higher harmonic suppression device for ground signals and vehicle-mounted equipment, which is applied to a substation, a section station or a switching station of a traction power supply system of a railway system, and specifically comprises AT least one filter circuit, i.e. a filter circuit is respectively arranged between a contact line and a steel rail of a power supply arm and between a positive feed line and the steel rail in an AT power supply mode, and a filter circuit is arranged between the contact line and the steel rail of the power supply arm in a direct power supply mode, so that higher harmonics on a loop between the contact line/the positive feed line and the steel rail can be filtered through the filter circuit, and thus, the fluctuation of a receiving voltage of a track circuit or the abnormal braking of a locomotive caused by the higher harmonics can be avoided.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view illustrating an installation of a harmonic suppression apparatus according to an embodiment of the present application;
fig. 2 is a schematic view illustrating an installation of a higher harmonic suppression device in an AT power supply mode according to an embodiment of the present application;
FIG. 3 is a schematic diagram illustrating an installation of a harmonic suppression device in a direct power supply manner according to an embodiment of the present application;
FIG. 4 is a circuit diagram of another filtering circuit according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a filter circuit according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram of a filter circuit according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a schematic view illustrating an installation of a harmonic suppression device according to an embodiment of the present application.
As shown in fig. 1, the harmonic suppression device according to the present embodiment is applied to a railway system, and specifically, is installed in a substation, a section station, an open/close station, or the like of a traction power supply system of the railway system. In particular, the higher harmonic suppression means comprise at least one filter circuit. For the present embodiment, there are one or two filter circuits.
When the railway system adopts an AT power supply mode, two filter circuits need to be selected, as shown in fig. 2, one end of one filter circuit is connected with a contact line of a power supply arm, and the other end of the filter circuit is connected with a contact point on a steel rail; one end of the other filter circuit is connected with the positive feeder of the power supply arm, and the other end of the other filter circuit is connected with a contact point on the steel rail.
The AT power supply mode is a power supply mode of electric traction, is also called as an autotransformer power supply mode, and is a power supply mode provided with an autotransformer and adopted by a single-phase power frequency alternating current electrified railway for improving power supply quality and reducing interference on communication.
The special equipment for AT power supply mainly has a positive feeder line parallel to the contact line and low impedance autotransformers arranged AT regular intervals. The positive feed line is a path for returning traction load to the substation, and the allowable current capacity of the positive feed line is equivalent to the allowable current capacity of the contact line. The turn ratio of the first winding to the second winding of the autotransformer is 2:1, one end of the autotransformer is connected with the contact line, the other end of the autotransformer is connected with the positive feeder, and the middle point of the autotransformer is connected with the neutral point of the steel rail or the choke transformer. The voltages to the ground of the contact line and the positive feeder line are equal, and the voltage between the contact line and the positive feeder line is 2 times of the voltage to the ground of the contact line and the positive feeder line.
When the railway system adopts a direct power supply mode, only one filter circuit is needed to meet the requirement, and as shown in fig. 3, one end of the filter circuit is connected with a contact line of a power supply arm, and the other end of the filter circuit is connected with a contact point on a steel rail.
The direct power supply mode is a traction network power supply mode with steel rails as main traction backflow paths. Two more common forms: one is a simple direct power supply mode (T-R mode) using a steel rail as a return conductor, and the other is a direct power supply mode (T-R-NF mode) using a return line additionally arranged in a return system and connected with the steel rail in parallel every 3-4 km.
The T-R-NF mode is slightly superior to the T-R mode in preventing the interference influence on the parallel approach communication lines. The interference effect is generally evaluated by the trailed net shading coefficient. The shielding coefficient is the ratio of the return component of the traction return flow to the total traction current.
The traction net in the direct power supply mode has simple structure, low manufacturing cost and convenient construction, operation and maintenance; in addition, the unit impedance of the traction network is small, and the voltage loss and the power loss of the traction network are small; however, the backflow component leaking into the ground through the transverse transition resistance between the rail and the ground is large, so that the ground potential of the steel rail is increased, and sometimes, a steel rail potential suppression measure needs to be taken to ensure safety.
No matter the AT power supply mode or the direct power supply mode is adopted, the neutral point of the choke transformer arranged on the steel rail is selected as the contact point on the steel rail.
Through the filter circuit connected in parallel between the contact line or the positive feeder and the steel rail, higher harmonics between the contact line and the steel rail and/or between the positive feeder and the steel rail can be filtered, and the filtered current frequency is higher harmonic current of 550-850 Hz and 1500-3000 Hz. The filter circuit may be a passive filter circuit, an active filter circuit, or a hybrid active filter circuit.
It can be seen from the above technical solutions that the present embodiment provides a higher harmonic suppression apparatus, which is applied to a substation, a section station or a switching station of a traction power supply system of a railway system, and specifically includes AT least one filter circuit, that is, a filter circuit is respectively disposed between a contact line of a power supply arm and a steel rail and between a positive feed line and the steel rail in an AT power supply mode, and a filter circuit is disposed between the contact line of the power supply arm and the steel rail in a direct power supply mode, and the higher harmonics on a loop between the contact line/the positive feed line and the steel rail can be filtered through the filter circuit, so that the fluctuation of a receiving voltage of a track circuit or the abnormal braking of a locomotive due to the higher harmonics is avoided.
The passive filter circuit provided in this embodiment includes a capacitor C1, a resistor R, and a reactor L1, as shown in fig. 4.
The one end of electric capacity is connected with the contact line or the positive feeder on the power supply arm, and the other end of electric capacity is connected with the one end of resistance, and the other end of resistance is used for connecting the rail, is used for connecting the neutral point connection of choke transformer on the rail specifically. In addition, a reactor is connected in parallel with the resistor.
In addition, the passive filter circuit also includes a discharge coil TV1, as shown in fig. 5. The discharge coil is connected in parallel with the capacitor for protecting the capacitor, and the passive filter circuit is further connected with a breaker QF and a lightning arrester F, as shown in fig. 4. The circuit breaker is arranged on a conductor for connecting one end of a capacitor with a contact line/positive feeder, and thus is disconnected in the presence of overcurrent or overvoltage, and plays a role in protecting the capacitor, the resistor and the inductor.
One end of the lightning arrester is connected with the lower end of the circuit breaker, namely the connection point of the circuit breaker and the capacitor, and the other end of the lightning arrester is grounded, so that the large current can be discharged under the condition that the contact line or the positive feeder line is struck by lightning, and the effect of protecting the capacitor, the resistor and the inductor under the contact line or the positive feeder line is achieved.
The active filter circuit in this embodiment includes a first compensation current generation circuit APF1, a first step-down transformer T1, and a first filter reactor L2, and further includes a first harmonic detection module and a first current tracking control module, as shown in fig. 5. One end of the primary side of the voltage-reducing transformer is connected with a contact line or a positive feeder line through a connecting line, the other end of the primary side of the voltage-reducing transformer is connected with a steel rail, and a current transformer CT and a circuit breaker QF are also arranged on the connecting line; one end of the secondary side of the first step-down transformer is connected with one end of the output end of the first active filter through the first filter reactor, and the other end of the secondary side is directly connected with the other end of the output end of the first compensation current generating circuit.
The active filter is a novel harmonic wave treatment special device manufactured by adopting the modern power electronic technology and the digital signal processing technology based on the high-speed DSP device. The compensation circuit consists of two main parts, namely an instruction current arithmetic circuit and a compensation current generating circuit.
The instruction current operation circuit monitors the current in a line in real time, converts an analog current signal into a digital signal, sends the digital signal into a high-speed Digital Signal Processor (DSP) to process the signal, separates harmonic waves from fundamental waves, sends a driving pulse to the compensation current generation circuit in a Pulse Width Modulation (PWM) signal form, drives an IGBT (insulated gate bipolar translator) or IPM (intelligent power module) power module, generates compensation current which is equal to the amplitude of harmonic current of a power grid and has opposite polarity, injects the compensation current into the power grid, compensates or counteracts the harmonic current, and actively eliminates the harmonic waves.
The first harmonic detection circuit monitors the current in the contact line or the positive feeder line in real time, and sends a current signal to the first current tracking control module to process the signal, and the first current tracking control module sends a driving pulse to the first compensation current generation circuit in a pulse width modulation signal mode according to a calculation result, so that the first compensation current generation circuit outputs a compensation current to compensate or offset the harmonic current. Meanwhile, a current signal is collected through a current transformer CT to judge whether the first compensation current generating circuit has a fault or an overcurrent, and if so, a protection tripping signal is given to trip a breaker QF to protect the first compensation current generating circuit.
The hybrid active filter circuit in this embodiment includes the second compensation current generation circuit APF2, the second step-down transformer T2, the second filter reactor L3, the passive filter circuit PF, and the fundamental wave series resonant circuit, and further includes a second harmonic detection module, a second current tracking control module, and a protection controller, as shown in fig. 6. The fundamental wave series resonant circuit includes a third capacitor C3 and an inductor L4. And the passive filter circuit here is the same as the aforementioned passive filter circuit.
One end of the passive filter circuit is connected with the contact line or the positive feeder line through a breaker QF1, a current transformer CT1 is further arranged on a lead for connecting the breaker QF1 with the contact line or the positive feeder line, and the other end of the passive filter circuit is connected with one end of the fundamental wave series resonance circuit; the other end of the fundamental wave series resonance circuit is connected with the steel rail; the secondary side of the second step-down transformer is connected in parallel with the fundamental series resonant circuit, and the secondary side is connected with the second passive filter circuit through a breaker QF 2.
And a current transformer CT2 is provided on the wire connecting the primary side to the circuit breaker QF 2. One end of the output end of the second compensation current generating circuit is connected with one end of the primary side of the second step-down transformer through the second filter reactor, and the other end of the output end of the second compensation current generating circuit is connected with the other end of the primary side of the second step-down transformer.
The fundamental wave series resonance circuit is used for filtering the 50Hz fundamental wave current passing through the passive filter, and the fundamental wave current is prevented from flowing into the second compensation current generating circuit through the coupling transformer. Since the passive filter circuit PF bears most of the fundamental voltage, the second compensation current generation circuit APF can realize harmonic compensation with a small capacity and a small loss. The second compensation current generation circuit may filter out residual harmonic currents of the passive filter circuit.
The protection controller collects a current signal output by the current transformer CT1 through the protection controller, judges whether a fault or overcurrent occurs in the system according to the current signal, and gives a protection tripping signal to trip the breaker QF1 if the fault or overcurrent occurs in the system, so that the protection of the whole hybrid active filter circuit is realized.
The second current tracking control module judges whether the second compensation current generating circuit APF2 has a fault or an overcurrent by collecting a current signal output by the current transformer CT2, and if so, a protection tripping signal is given to trip the circuit breaker QF2, so that the second compensation current generating circuit is protected.
The second harmonic detection module is used for carrying out harmonic detection by collecting current signals of a contact network or a positive feeder line, detecting harmonic current of a traction power supply system, judging compensation harmonic capacity required by the second compensation current generation circuit, and controlling the second compensation current generation circuit to carry out real-time dynamic compensation by adopting a current tracking control technology.
For convenience of description of connection of the harmonic suppression device provided by the present application in a railway system, the configuration of the suppression device is simplified, wherein only the core configuration of the suppression device provided by the embodiments of the present application is shown in the illustrated scenario, and other details are not shown.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The technical solutions provided by the present invention are described in detail above, and the principle and the implementation of the present invention are explained in this document by applying specific examples, and the descriptions of the above examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (8)
1. A higher harmonic suppression device of ground signal and on-board equipment is applied to a substation, a subarea station or a switching station of a traction power supply system of a railway system, and is characterized by comprising at least one filter circuit, wherein:
in the AT power supply mode, one filter circuit is connected between a contact line of a power supply arm and a steel rail in parallel, and the other filter circuit is connected between a positive feeder of the power supply arm and the steel rail in parallel;
in the direct power supply mode, the filter circuit is connected in parallel between the contact line of the power supply arm and the steel rail.
2. The harmonic suppression apparatus as claimed in claim 1, wherein said filter circuit is a passive filter circuit, an active filter circuit or a hybrid active filter circuit.
3. The higher harmonic suppression apparatus according to claim 2, wherein the circuit configuration is a second-order filter, and the filter circuit includes a capacitor, a resistor, and a reactor, wherein:
one end of the capacitor is connected with the contact line, and the other end of the capacitor is connected with one end of the resistor;
the other end of the resistor is connected with the steel rail;
the reactor is connected in parallel with the capacitor.
4. The higher harmonic suppression apparatus of claim 3 further comprising a discharge coil, wherein:
the discharge coil is connected in parallel with the capacitor.
5. The higher harmonic suppression apparatus of claim 3 further comprising a circuit breaker and a lightning arrester, wherein:
the circuit breaker is arranged on a connecting line for connecting the first capacitor and the contact line;
one end of the lightning arrester is connected with the lower end of the breaker, and the other end of the lightning arrester is grounded.
6. The higher harmonic suppression apparatus of claim 2, wherein the active filter circuit comprises a first compensation current generation circuit, a first harmonic detection module, a first current tracking control module, a first step-down transformer, and a first filter reactor, wherein:
the output end of the first compensation current generating circuit is connected with the secondary side of the first step-down transformer through the first filter reactor;
one end of the primary side of the first step-down transformer is connected with the contact line or the positive feeder line, and the other end of the primary side of the first step-down transformer is connected with the wiring terminal;
the first harmonic detection module is connected with the contact line or the positive feeder line and is used for detecting harmonic signals on the contact line or the positive feeder line;
the second current tracking control module is used for receiving the harmonic signal and outputting a driving pulse to the first compensation current generating circuit based on the harmonic signal.
7. The higher harmonic suppression apparatus according to claim 2, wherein the hybrid active filter circuit includes a second compensation current generation circuit, a second harmonic detection module, a second current tracking control module, a protection controller, a second step-down transformer, a second filter reactor, the passive filter circuit, and a fundamental wave series resonant circuit, wherein:
one end of the passive filter circuit is connected with the contact line or the positive feeder line, the other end of the passive filter circuit is connected with one end of the primary side of the second step-down transformer, and the other end of the primary side is connected with the wiring terminal;
the fundamental wave series resonance circuit is connected with the primary side in parallel;
the output end of the second compensation current generating circuit is connected with the secondary side of the second step-down transformer through the second filter reactor;
the second current tracking control module is used for detecting whether the second compensation current generator has faults or overcurrent;
the second harmonic detection module is connected with the contact line or the positive feeder line and is used for detecting harmonic signals on the contact line or the positive feeder line;
the protection controller is used for protecting the hybrid active filter circuit.
8. The higher harmonic suppression apparatus according to claim 7, wherein the fundamental wave series resonance circuit includes a third capacitor and an inductor connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010979379.0A CN112054526A (en) | 2020-09-17 | 2020-09-17 | Ground signal and on-board unit's higher harmonic suppression device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010979379.0A CN112054526A (en) | 2020-09-17 | 2020-09-17 | Ground signal and on-board unit's higher harmonic suppression device |
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| CN112054526A true CN112054526A (en) | 2020-12-08 |
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| CN202010979379.0A Pending CN112054526A (en) | 2020-09-17 | 2020-09-17 | Ground signal and on-board unit's higher harmonic suppression device |
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Effective date of registration: 20211122 Address after: 102613 No.456, langlongsi village, Huangcun Town, Daxing District, Beijing Applicant after: BEIJING RAILWAY SIGNAL Co.,Ltd. Address before: 102613 No.456, langlongsi village, Huangcun Town, Daxing District, Beijing Applicant before: Rail Transit Technology Research Institute of Tonghao (Beijing) Rail Industry Group Co.,Ltd. Applicant before: China Communications (Beijing) Railway Industry Group Co., Ltd |
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